Bad breath, medically termed 'halitosis,' is a common problem reported by pet owners. The most common cause of halitosis is some sort of dental problem. Bacteria, saliva, and food particles can form plaque, which causes bad breath. This can further develop into gingivitis, or worse, periodontal disease, which will make the breath even more unpleasant.

Other oral disease, such as tonsillitis, cancer, trauma, and some autoimmune diseases

Any pet with bad breath should be examined by a veterinarian, unless you know it is caused by something the pet ate. Some causes of bad breath can cause severe and even fatal complications, if not treated promptly.